Re: Show, Eq not necessary for Num [Was: Revamping the numeric classes]

Sat, 10 Feb 2001 14:09:59 +1300, Brian Boutel pisze:

Can you demonstrate a revised hierarchy without Eq? What would happen to Ord, and the numeric classes that require Eq because they need signum?

signum doesn't require Eq. You can use signum without having Eq, and you can sometimes define signum without having Eq (e.g. on functions). Sometimes you do require (==) to define signum, but it has nothing to do with superclasses. -- __("< Marcin Kowalczyk * qrczak@knm.org.pl http://qrczak.ids.net.pl/ \__/ ^^ SYGNATURA ZASTÊPCZA QRCZAK